CN102246256B - Compensation of anode wobble for X-ray tubes of the rotary-anode type - Google Patents
Compensation of anode wobble for X-ray tubes of the rotary-anode type Download PDFInfo
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- CN102246256B CN102246256B CN200980149182.6A CN200980149182A CN102246256B CN 102246256 B CN102246256 B CN 102246256B CN 200980149182 A CN200980149182 A CN 200980149182A CN 102246256 B CN102246256 B CN 102246256B
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
- H01J35/00—X-ray tubes
- H01J35/02—Details
- H01J35/04—Electrodes ; Mutual position thereof; Constructional adaptations therefor
- H01J35/08—Anodes; Anti cathodes
- H01J35/10—Rotary anodes; Arrangements for rotating anodes; Cooling rotary anodes
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
- H01J35/00—X-ray tubes
- H01J35/02—Details
- H01J35/14—Arrangements for concentrating, focusing, or directing the cathode ray
- H01J35/153—Spot position control
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- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05G—X-RAY TECHNIQUE
- H05G1/00—X-ray apparatus involving X-ray tubes; Circuits therefor
- H05G1/08—Electrical details
- H05G1/26—Measuring, controlling or protecting
- H05G1/30—Controlling
Abstract
The present invention refers to X-ray tubes of the rotary-anode type for generating a fan beam of X-rays. More particularly, the invention is concerned with a system and method for compensating a class of system-related disturbances of the focal spot position FS on a target area of the rotating anode RA and particularly for compensating the anode wobble in an X-ray tube XT of the aforementioned type, which occurs as a periodically wobbling inclination angle of the anode disk's rotational plane with respect to an ideal rotational plane (z = 0) which is oriented normal to the rotational axis z of the rotary shaft S on which the anode disk RA is inclinedly mounted due to an inaccuracy during its production process. For this purpose, the electron beam generated by a thermoionic or other type of electron emitter of the tube's cathode C and thus the focal spot position FS on a target area of the anode disk's X-ray generating surface (anode target) are steered such that the focal spot FS stays within the plane PCXB of the central X-ray fan beam CXB.
Description
Technical field
The present invention relates to the rotary anode type x-ray tube for generation of X ray fan beam.More specifically, the present invention relates to a kind of system and method, for compensating the type systematic relevant interference of focal spot position to rotating anode targeting regions, be particularly useful for the anode compensated in the X-ray tube of the above-mentioned type to swing, this swing occurred is the periodic wobble inclination angle of Plane of rotation relative to desirable Plane of rotation of anode disc, the desirable orientation of Plane of rotation and the rotating shaft direct cross of rotating shaft, anode disc tilts to be installed in rotating shaft due to inaccuracy in its production process.For this purpose, guide the electron beam produced by the thermion of tube cathode or other types electron emitter, thus guide the focal spot position on the targeting regions (anode target) on the X ray generation surface of anode disc, focal spot is rested within the plane of central X-ray fan beam.
Background technology
Conventional X-ray tubes for high-power operation generally includes vacuum chamber (shell), and it holds cathode filament, and heating current or heater current are flowed by cathode filament.Between electron emitting cathode and tube anode, apply high voltage potential, it is usually between 40kV and 160kV.This voltage potential makes the electronics of cathode emission accelerated in anode direction.Beam, then with the zonule (focal spot) on abundant kinetic energy impinge anode surface, to produce the X-ray beam be made up of high-energy photon, then can be such as used for imaging of medical or material analysis by the electron beam launched.
Rotary anode type x-ray tube is made in nineteen thirties the earliest.Compared with fixed anode, rotating anode advantage is the heat energy deposited on anode target focal spot that can distribute on the larger surface of focus ring (also referred to as " focus track ").The power in short running time is made to increase in order to possibility like this.But, because present anode disc rotates in a vacuum, effective not as the liquid cools used in fixed anode to shell exterior conductive heat energy.So design rotarting anode, to realize high hot memory capacity below focus track, realizes good radiation exchange between anode disc and shell.Need the anode disc minimum diameter between 80 and 240mm, the slight oscillatory of the most about 0.05mm can be caused like this.For little optics focal spot size to 0.15mm (in perspective view, the X-ray detector as the x-ray system from X-ray tube as described in comprising is seen), this is very large swing.
Summary of the invention
In rotary anode type Conventional X-ray tubes that morning session is sold, due to the mechanical tolerance during production process and inexactness, will not on anode axle straight installation rotarting anode.Therefore, usually have some hunt effects, thus cause the positional cycle change that focal spot is put at plate target.As a result, focal spot may thicken.Thus, object of the present invention will overcome this problem exactly.
In view of this object, first one exemplary embodiment of the application relates to a kind of for measuring and the system of the physical location of compensate for electronic bundle focal spot and the reproduction deviation of desired locations, described electron beam is launched on the targeting regions of the rotarting anode dish of described X-ray tube by the electron emitter of the negative electrode of X-ray tube, wherein, described system comprises the position transducer for detecting the reproduction deviation during its at least one cycle, for making the beam deflection unit with integrated manipulator of described deflection of a beam of electrons based on the measurement result obtained from described position transducer.
According to the preferred aspect of the present embodiment, described system especially can be suitable for measuring and compensate the periodic wobble of rotarting anode dish relative to the inclination angle of desirable Plane of rotation of X-ray tube, the orientation of described desirable Plane of rotation is orthogonal with rotating shaft, described rotarting anode dish tilts to be installed in described rotating shaft due to the inexactness in its production process, wherein, described position transducer is suitable for detecting described inclination angle deviation in time.
According to proposed the present invention, especially can propose described position transducer and comprise location sensing modules, the deviation amplitude that described location sensing modules departs from along the direction of the rotating shaft of the rotating shaft of described rotarting anode dish for the position of detecting described focal spot.Thus, described position transducer may be implemented as capacitance type sensor or optical pickocff, and it is provided for the information of the deviation amplitude deriving described focal spot.As its alternative, described position transducer also may be implemented as current sensor, and described current sensor, for measuring the number of the scattered electron flown over by the hole of described transducer, then can derive the deviation amplitude of described focal spot from this number.According to the 3rd alternative, at least one width camera images that described position transducer can be configured to every width radioscopic image and the hard-wired camera produced by the x-ray system belonging to more described X-ray tube derives described deviation amplitude, can take the deviation amplitude of described focal spot from described camera.
The integrated manipulator of described beam deflection unit preferably can be configured to guide described electron beam, the electron beam focal spot that the X ray of described rotarting anode dish is produced in targeting regions on the surface remains within the plane of central X-ray fan beam, wherein, described plane is provided by the basic plane with the rotating shaft direct cross of the rotating shaft at the place, time average position of described focal spot.
Such as, the integrated manipulator of beam deflection unit can be configured to guide described electron beam, makes the focal track of electron beam depict oval trace.According to its alternative, described controller can be configured to guide described electron beam, the focal track of described electron beam is depicted can predefined trace, also to compensate mount vibration and anode disc curvature effect except the periodic wobble at the inclination angle that compensates described rotarting anode dish.
The component of the focal spot position that anode disc surface (being thus basically parallel to the symmetry axis z of anode rotating shaft) is pointed to is basically perpendicular in a similar manner with compensation, also can by measure with those components of the interference of the focal spot position of the tangent sensing of anode disc (namely in azimuth direction orientation) and deflection beam compensates these components in corresponding tangential direction.
Second one exemplary embodiment of the application relates to a kind of rotary anode type x-ray tube, and it comprises above with reference to the system described in described first one exemplary embodiment.
3rd one exemplary embodiment of the application relates to a kind of for measuring and the method for the physical location of compensate for electronic bundle focal spot and the reproduction deviation of desired locations, described electron beam is launched on the targeting regions of the rotarting anode dish of described X-ray tube by the electron emitter of the negative electrode of X-ray tube, wherein, described method comprises the step of the reproduction deviation detected during its at least one cycle and makes the step of described deflection of a beam of electrons based on the measurement result obtained from described measuring process.
According to the preferred aspect of the present embodiment, described method can be suitable for measuring and compensate the periodic wobble of rotarting anode dish relative to the inclination angle of desirable Plane of rotation of X-ray tube, the orientation of described desirable Plane of rotation is orthogonal with rotating shaft, described rotarting anode dish tilts to be installed in described rotating shaft due to the inexactness in its production process, wherein, described detecting step is suitable for detecting described inclination angle deviation in time.
Preferably, described electron beam can be guided, the electron beam focal spot that the X ray of described rotarting anode dish is produced in targeting regions on the surface remains within the plane of central X-ray fan beam, wherein, described plane is provided by the basic plane with the rotating shaft direct cross of the rotating shaft at the place, time average position of described focal spot.
Described electron beam can be guided thus, make the focal track of described electron beam depict oval trace.Or can guide described electron beam, making the focal track of described electron beam depict can predefined trace, also to compensate mount vibration and anode disc curvature effect except the periodic wobble compensating described rotarting anode dish inclination angle.
According to the present invention, can also propose to perform described measuring process during the production process of the system for performing described method, and during the course of work, optionally repeat described measuring process so that described system can be recalibrated.In described measuring process, thus can by for detecting to the focal spot position measurement of the anode Phase-Resolved Analysis of the influential various Warm status of hunt effect the amplitude that focal spot position departs from the direction of the rotating shaft of rotarting anode axle.
Finally, the 4th one exemplary embodiment of the application relates to a kind of software program product, and it is when running on the processing unit with reference to the system described in described first one exemplary embodiment, for performing with reference to the method described in described 3rd one exemplary embodiment.
Accompanying drawing explanation
Also these and other favourable aspects of the present invention are set forth by way of example with reference to accompanying drawing with reference to embodiment hereinafter described.In the accompanying drawings,
The routine that Fig. 1 a shows for the rotational x-ray scanning machine system based on removable C arm in the known tomographic X-ray imaging of prior art arranges structure,
Fig. 1 b shows the schematic cross-section of the known conventional rotary anode type x-ray tube of prior art, can used as in Fig. 1 a based on the x-ray source of the rotational x-ray scanning machine system of C arm,
Fig. 2 a is the exemplary rotating anode two kinds of rotatable phases (swing state) showing the Conventional X-ray tubes tilting to be installed on its anode axle in schematic cross-section, described phase place offsets the anglec of rotation of 180 ° each other, and with rotarting anode dish relative to the different inclination angle of rotating anode Plane of rotation for feature, this illustrates, due to the reason of described hunt effect, electron beam focal spot position on the X ray emitting surface of impinge anode dish on taper sloped target mark region is along with rotatable phase consecutive variations
Fig. 2 b shows in Fig. 2 a the rotating anode schematic cross-section showing and install for being in the first rotatable phase medium dip, be tilted to the left relative to rotating anode Plane of rotation at the first rotatable phase Anodic dish, the electron beam focal spot position on the targeting regions of the X ray emitting surface striking anode disc is made to be arranged in the plane of central X-ray fan beam
Fig. 2 c shows in Fig. 2 a the rotating anode schematic cross-section showing and install for being in the second rotatable phase medium dip, this obtains after the rotating shaft coiling its rotating shaft at rotarting anode rotates a half-turn or its odd-multiple, it illustrates, anode disc is tilted to the right relative to rotating anode Plane of rotation, the electron beam focal spot position on the targeting regions of the X ray emitting surface striking anode disc is made no longer to be arranged in the plane of central X-ray fan beam
Fig. 3 a shows for measuring and compensating the system of anode disc relative to the periodic wobble at the inclination angle of its Plane of rotation, and rotating anode above-mentioned two kinds of rotatable phases that the inclination for Conventional X-ray tubes shown in Fig. 2 a is installed have carried out exemplary illustration,
Fig. 3 b shows in Fig. 3 a the rotating anode schematic cross-section showing and install for being in the first rotatable phase medium dip, be tilted to the left relative to rotating anode Plane of rotation at the first rotatable phase Anodic dish, the electron beam focal spot position on the targeting regions of the X ray emitting surface striking anode disc is made to be arranged in the plane of central X-ray fan beam, and
Fig. 3 c shows in Fig. 3 a the rotating anode schematic cross-section showing and install for being in the second rotatable phase medium dip, this obtains after the rotating shaft coiling its rotating shaft at rotarting anode rotates a half-turn or its odd-multiple, it illustrates, anode disc is tilted to the right relative to rotating anode Plane of rotation, make the output signal deflection beam left that must detect according to position transducer, with the plane making the electron beam focal spot position on the targeting regions of the X ray emitting surface striking anode disc be arranged in central X-ray fan beam.
Reference numerals list:
AB anode body (substrate), is made up of refractory metal (such as SiC layer)
AT anode target, is made up of refractory metal (such as SiC layer)
B ball bearing
BD beam deflection unit
C electron emission filament cathode
CA C arm
The horizontal C arm axle of CAA, perpendicular to propeller shaft PA
CH vacuum chamber
CS X-ray tube housing (shell)
CoS cooling system
CU control unit
CXB central X-ray fan beam CXB
D X-ray detector
EB electron beam
FS focal spot (also referred to as focal spot position)
HVG high-voltage generator
IC C arm component etc. center
LA L arm
LAA L arm axle
LSH lead screen
M C arm installed part
MF machinery is fixing
O oil
OC oil connects
P high voltage plug
PA horizontal propeller axle
P
cXBthe plane of central X-ray fan beam CXB
PT patient table
RA rotarting anode (here also referred to as anode disc), it comprises described anode body AB and anode target AT
RO rotor
S rotating shaft
SO x-ray source
ST stator
VC vacuum
W window
WS position transducer
XB X-ray beam
XT X-ray tube
H axle S is in plane P
cXBupper outstanding height
The diameter projected of Δ l focal spot FS, in a z-direction by perspective draw, such as on the right side of anode disc RA shown in Fig. 2 a and 3a from the plane P being positioned at central X-ray beam CXB
cXBin point of observation viewing
Z rotating shaft (symmetry axis of=rotarting anode RA)
Δ z due to the swing effect of rotarting anode dish RA, the reproduction deviation (deviation amplitude) of focal spot position FS on ± z direction
the anglec of rotation (plus or minus) of rotarting anode dish RA
given rotatable phase (wherein
θ
1about the anglec of rotation of the y-axis of the static 3D cartesian coordinate system of rectangular axes x, y and z leap
θ
2about the anglec of rotation of the z-axis of static 3D cartesian coordinate system
The x-axis of the static 3D cartesian coordinate system of x, represents the direction of C arm axle CAA
The y-axis of the static 3D cartesian coordinate system of y, represents the direction of L arm axle LAA
The z-axis of the static 3D cartesian coordinate system of z, represents the direction of propeller shaft PA
Embodiment
Hereinafter, the problem and the preferred embodiments of the present invention that will solve will be explained with reference to accompanying drawing in more detail.
In fig 1 a, (such as, disclosed in US 2002/0168053A1) shown from related art is known arranges structure for the routine based on removable C arm rotational x-ray scanning machine system in tomographic X-ray imaging.Illustrated CT system comprises the x-ray source SO and X-ray detector D that are arranged in C arm CA opposite end, C arm is pivotally installed, C arm installed part M can be utilized to rotate around horizontal propeller axle PA with perpendicular to the horizontal C arm axle CAA of described propeller shaft, thus the y of the static 3D cartesian coordinate system allowing described x-ray source and X-ray detector to cross over around rectangular axes x, y and z and/or z-axis rotate an anglec of rotation (is respectively θ
1or θ
2), wherein, x-axis has the direction of C arm axle CAA, and y-axis is the vertical axis orthogonal with the plane of patient table (z-x plane), and z-axis has the direction of propeller shaft PA.Thus, the C arm axle CAA pointed to along the direction orthogonal with plan (y-z plane) pass through C arm component etc. center IC.Straight connecting line between the focal spot position of x-ray source SO and the center of X-ray detector D is crossing with propeller shaft PA and C arm axle CAA at the coordinate place of IC such as the center of grade.Utilize L arm LA to pivot C arm CA, can rotate around L arm axle LAA, the coordinate place that L arm axle LAA has Bing Deng center, the direction IC of y-axis is crossing with propeller shaft PA and C arm axle CAA.There is provided control unit CU with the work of continuous control at least two motor, at least two motor are used for along around the appointment trace mobile x-ray source SO of object of interest and X-ray detector D, when rotating around L arm axle LAA or propeller shaft PA, object of interest be placed within spherical track (examination scope) that C arm CA covers etc. in IC region, center.Easily find out from Fig. 1 a, the C arm CA with X-ray detector D and x-ray source SO can be rotated around C arm axle CAA, meanwhile, rotate C arm installed part M around propeller shaft PA, and gather the projected image of the object of interest of examine.
The schematic section of the conventional rotary anode type x-ray tube known from prior art has been shown in Fig. 1 b.X-ray tube comprises the fixed negative pole C within vacuum chamber CH that glass or metal-glass shell provide and is attached fixedly to the rotatably supported anode target AT of rotating shaft S.When being exposed to abundant high-octane electron beam incident on the focus orbital region on anode target inclined surface, due to the high voltage applied between negative electrode and described anode, from electronics described in anode target injection of material, produce cone type X-ray bundle XB by rotarting anode target AT and launched by the window W of the shell CS comprising vacuum chamber.
Already explained hereinabove, due to the mechanical tolerance during production process and inexactness, rotarting anode will not straightly be arranged on anode axle.Therefore, usually have some hunt effects, thus cause the positional cycle change that focal spot is put at plate target, and then focal spot may be fogged.Fig. 2 a is exemplary in schematic cross-section shows the different rotatable phase of two of the rotarting anode RA tilting to be installed on Conventional X-ray tubes on its rotarting anode axle S.As shown in this width figure, these rotatable phases offset the anglec of rotation of 180 ° each other, and with rotarting anode dish RA relative to the different inclination angle of rotating anode Plane of rotation for feature.Thus, Fig. 2 a illustrates, due to described hunt effect, the focal spot position FS impinging upon the electron beam on the taper inclination targeting regions AT on the X ray emitting surface of anode disc is consecutive variations along with rotatable phase.When the radial dimension of focal spot FS is little, the absolute value of amplitude of fluctuation is at least its very most of (especially for large anode disc), and the time for exposure is in the scope of anode swing circle or longer.Therefore, focal spot FS thickens, the picture quality obtained is affected, or correspondingly must reduces the optical dimensions (this refers to the diameter of focal spot FS) of rated power and electron beam, remain within predefined design limit to make the size of time averaging focal spot FS.
In figure 2b, the schematic cross-section of the rotarting anode RA that the inclination shown in Fig. 2 a is installed is shown in the anglec of rotation
(wherein
) be in (also referred to as " the first swing state ") in the first rotatable phase, be tilted to the left relative to the Plane of rotation of rotarting anode RA at the first rotatable phase Anodic dish, make the focal spot FS of the electron beam on the targeting regions AT of the X ray emitting surface striking anode disc be positioned at the plane P of central X-ray fan beam CXB
cXBin, plane P
cXBprovided by the plane of the rotating shaft direct cross of basic and anode rotating shaft S, the time average position of focal spot FS is positioned at wherein.Ideally, P can be represented by the Hessian normal form z=0 of anode disc Plane of rotation
cXB.In contrast, Fig. 2 c shows in Fig. 2 a and shows in the anglec of rotation
(wherein k ∈ /) is in the schematic cross-section of the rotarting anode RA that the inclination in the second rotatable phase (" the second swing state ") is installed, and this represents at rotarting anode dish RA after the rotating shaft of its rotating shaft S rotates a half-turn or its odd-multiple.In this width figure, anode disc RA is tilted to the right relative to rotating anode Plane of rotation, makes the focal spot position FS of the electron beam on the targeting regions AT of the X ray emitting surface striking anode disc no longer be positioned at the plane P of central X-ray fan beam CXB
cXBin.
If
or
rotarting anode dish RA is rotated 180 ° by direction, situation shown in from the situation shown in Fig. 2 b to Fig. 2 c, just the position of focal spot FS on the X ray emitting surface of anode target AT be deviate from deviation amplitude Δ z along-z direction, z represents the direction of the rotating shaft of anode axle.Otherwise, if
or
rotarting anode dish RA is rotated 180 ° by direction, the situation shown in from the situation shown in Fig. 2 c to Fig. 2 b, just the position of focal spot FS on the X ray emitting surface of anode target AT be deviate from deviation amplitude Δ z along+z direction.This is because rotarting anode is installed on the Plane of rotation (orientation of Plane of rotation is orthogonal with the rotating shaft z of rotarting anode axle S) of anode disc by inclination, electron beam is parallel to this rotating shaft usually.
Thus, deviation amplitude Δ z can between 30 μm (for new pipes) and about 100 microns (for old pipe).If Δ z reaches the very most of of projection focused spot diameter Δ l, projection focused spot diameter draws by perspective in a z-direction, and the right side of such as, anode disc RA shown in Fig. 2 a is from the plane P being positioned at central X-ray beam CXB
cXBin point of observation viewing, and if X-ray pulse length is approximately half anode swing circle or longer, then radioscopic image fogs.In order to avoid this blurring effect, must reduce focal spot size, this causes rated power to reduce.
According to the present invention, before on the targeting regions AT clashing into rotarting anode dish, radially deflect the electron beam produced by the thermion of tube cathode C or other types electron emitter, compensate described hunt effect.For this purpose, guide described electron beam, the position of its focal spot FS that the X ray being positioned at anode target AT is produced on (usual taper inclination) surface remains on the plane P of central X-ray fan beam CXB
cXBwithin.Usually this can cause the oval trace shape of focal track.But, can also electron beam be guided, make it follow any other focus track trace, to compensate any other mechanical distortion except the periodic wobble effect that the inclination angle continuously changing the rotarting anode dish RA tilting to install causes.
As shown in fig. 3a, present invention thus provides a kind of for measuring and compensating the system of anode disc relative to the periodic wobble at the inclination angle of its Plane of rotation (orientation of Plane of rotation and the rotating shaft direct cross of rotating shaft S), rotating anode above-mentioned two kinds of selected phases of installing of the inclination for Conventional X-ray tubes are as shown in Figure 2 a exemplary shows this system.Can perform described measurement by position transducer WS during production process and (optionally) repetition during the X-ray tube XT course of work, implementing these as thus can for measuring the focal spot position of the anode Phase-Resolved Analysis of the influential various Warm status of the hunt effect of distortion (such as being bent by anode disc).Based on this measurement, the control data that measurement result from described position transducer WS derives is supplied to the integrated beam deflection unit BD of described X-ray tube XT, wherein, described beam deflection unit is used for correspondingly guiding the electron beam of being launched by the thermion of tube cathode or other types electron emitter.During operation, then can repeat described measurement, to recalibrate described system.Except above-mentioned hunt effect, also at least can other distortions relevant to system of partial-compensation (such as, mount vibration and anode disc bend) by applying the system and method for advocating.
In order to illustrate advocated method, Fig. 3 b shows the schematic cross-section of the rotarting anode RA that Fig. 3 a medium dip is installed when being shown in above-mentioned first rotatable phase, be tilted to the left relative to the Plane of rotation of rotarting anode RA at the first rotatable phase Anodic dish, make the focal spot position FS of the electron beam on the targeting regions AT of the X ray emitting surface striking anode disc be positioned at the plane P of central X-ray fan beam
cXBin.As can be seen from this width figure, in this ideal case, the deviation amplitude Δ z of focal spot position FS equals zero.
As a comparison, Fig. 3 c shows in Fig. 3 a and shows for the schematic cross-section of rotarting anode RA that the inclination in above-mentioned second rotatable phase is installed, and this obtains after the rotating shaft coiling its rotating shaft S at rotarting anode rotates a half-turn or its odd-multiple.Thus, Fig. 3 c illustrates, anode disc is tilted to the right relative to the Plane of rotation of rotarting anode RA, the output signal that must detect according to described position transducer WS is made to deflect the electron beam of being launched by the thermion of tube cathode or other types electron emitter left, with the plane P making the focal spot position FS of the electron beam on the targeting regions AT of the X ray emitting surface striking anode disc be positioned at central X-ray fan beam CXB
cXBin.
So the system and method proposed makes the accuracy of power termination and focal spot position improve and makes picture quality strengthen.On the other hand, it should be pointed out that above-mentioned compensation only accurately works in central X-ray fan beam CXB.But, usually focal spot FS is specified for this direction, most important region normally its center of radioscopic image.
Application of the present invention
When using in based on the medical treatment of X ray and non-medical applications, especially can apply the present invention in the X-ray tube of rotary anode type, wherein, picture quality must be produced and strengthen and the radioscopic image that improves of power termination.In addition, advantageously the present invention can be applied in those X-ray tubes of the above-mentioned type, wherein, the fuzzy of focal spot is that the mechanical distortion bent by anode hunt effect and such as mount vibration and anode disc causes, and this is by the remarkable deterioration that can cause obtained picture quality.
Although to The present invention gives detailed diagram and explanation in accompanying drawing and aforementioned explanation, should such diagram and explanation be regarded as illustrative or exemplary, but not determinate, this means that the present invention is not limited to the disclosed embodiments.By research accompanying drawing, specification and claims, those skilled in the art can to understand in the middle of the process of the present invention for required protection and to implement other modification for the disclosed embodiments putting into practice.In the claims, " comprising " one word do not get rid of other elements or step, singular article does not get rid of plural number.In addition, point out, any Reference numeral comprised in claim should not be construed as limiting the scope of the invention.
Claims (12)
1. one kind for measuring and compensating the system of the physical location of the electron beam focal spot (FS) of X-ray tube and the reproduction deviation (Δ z) of desired locations, described electron beam (EB) launches by the electron emitter of the negative electrode of X-ray tube (C) is upper in the targeting regions (AT) of the rotarting anode dish (RA) of described X-ray tube, wherein, described system comprises the position transducer (WS) being suitable for the described reproduction deviation detected during its at least one cycle, being suitable for based on the measurement result obtained from described position transducer (WS), described electron beam (EB) being deflected thus the focal track of described electron beam is depicted can the beam deflection unit (BD) with integrated manipulator of predefined trace, described system is suitable for measuring and compensates the periodic wobble of rotarting anode dish (RA) relative to the inclination angle of desirable Plane of rotation of X-ray tube, the orientation of described desirable Plane of rotation is orthogonal with rotating shaft (S), described rotarting anode dish (RA) is tilted to be installed in described rotating shaft due to the inexactness in its production process, wherein, described position transducer (WS) is suitable for detecting described inclination angle deviation in time
Wherein, described position transducer (WS) comprises location sensing modules, the deviation amplitude (Δ z) that described location sensing modules departs from along the direction of the rotating shaft (z) of the rotating shaft (S) of described rotarting anode dish for the position of detecting described focal spot (FS).
2. system according to claim 1,
Wherein, described position transducer (WS) is implemented as capacitance type sensor or optical pickocff, and it is provided for the information of the described deviation amplitude (Δ z) deriving described focal spot (FS).
3. system according to claim 1,
Wherein, described position transducer (WS) is implemented as current sensor, described current sensor, for measuring the number of the scattered electron flown over by the hole of described transducer, then can derive the described deviation amplitude (Δ z) of described focal spot (FS) from this number.
4. system according to claim 1,
Wherein, at least one width camera images that described position transducer (WS) is configured to every width radioscopic image and the hard-wired camera produced by the x-ray system belonging to more described X-ray tube (XT) derives described deviation amplitude (Δ z), can take the described deviation amplitude (Δ z) of described focal spot (FS) from described camera.
5. the system according to any one in claim 1 to 4,
Wherein, the described integrated manipulator of described beam deflection unit (BD) is configured to guide described electron beam (EB), makes the X ray of described rotarting anode dish (RA) electron beam focal spot (FS) produced in targeting regions on the surface remain on the plane (P of central X-ray fan beam (CXB)
cXB) within, wherein, described plane is provided by the basic plane with the described rotating shaft direct cross of the described rotating shaft (S) at the place, time average position of described focal spot (FS).
6. the X-ray tube (XT) of a rotary anode type, comprises the system according to any one in claim 1 to 5.
7. one kind for measuring and compensating the method for the physical location of the electron beam focal spot (FS) of X-ray tube and the reproduction deviation (Δ z) of desired locations, described electron beam (EB) launches by the electron emitter of the negative electrode of X-ray tube (C) is upper in the targeting regions (AT) of the rotarting anode dish (RA) of described X-ray tube, wherein, described method comprises and detects the step of the described reproduction deviation during its at least one cycle by means of position transducer (WS) and based on the measurement result that the step from described detection obtains, described electron beam (EB) is deflected thus the focal track of described electron beam is depicted can the step of predefined trace, described position transducer (WS) comprises location sensing modules, the deviation amplitude (Δ z) that described location sensing modules departs from along the direction of the rotating shaft (z) of the rotating shaft (S) of described rotarting anode dish for the position of detecting described focal spot (FS),
Described method is suitable for measuring and compensates the periodic wobble of rotarting anode dish (RA) relative to the inclination angle of desirable Plane of rotation of X-ray tube, the orientation of described desirable Plane of rotation is orthogonal with rotating shaft (S), described rotarting anode dish (RA) is tilted to be installed in described rotating shaft due to the inexactness in its production process, wherein, described detecting step is suitable for detecting described inclination angle deviation in time.
8. method according to claim 7,
Wherein, guide described electron beam (EB), make the X ray of described rotarting anode dish (RA) electron beam focal spot (FS) produced in targeting regions on the surface remain on the plane (P of central X-ray fan beam (CXB)
cXB) within, wherein, described plane is provided by the basic plane with the described rotating shaft direct cross of the described rotating shaft (S) at the place, time average position of described focal spot (FS).
9. method according to claim 8,
Wherein, guide described electron beam (EB), make the focal track of described electron beam depict oval trace.
10. method according to claim 8,
Wherein, guide described electron beam (EB), the focal track of described electron beam is depicted can predefined trace, also to compensate mount vibration and anode disc curvature effect except the described periodic wobble at the inclination angle that compensates described rotarting anode dish.
11. methods according to any one in claim 7 to 10,
Wherein, during the production process of the system for performing described method, perform described measuring process, and during the course of work, optionally repeat described measuring process so that described system can be recalibrated.
12. 1 kinds of computer programs, when it is in the processing module running on the system according to any one in claim 1 to 5, for implementing the method according to any one in claim 7 to 11.
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| EP08170899.2 | 2008-12-08 | ||
| EP08170899 | 2008-12-08 | ||
| PCT/IB2009/055436 WO2010067260A1 (en) | 2008-12-08 | 2009-12-01 | Compensation of anode wobble for x-ray tubes of the rotary-anode type |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN102246256A CN102246256A (en) | 2011-11-16 |
| CN102246256B true CN102246256B (en) | 2015-02-11 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN200980149182.6A Active CN102246256B (en) | 2008-12-08 | 2009-12-01 | Compensation of anode wobble for X-ray tubes of the rotary-anode type |
Country Status (6)
| Country | Link |
|---|---|
| US (1) | US8761342B2 (en) |
| EP (1) | EP2374144B1 (en) |
| JP (1) | JP5540008B2 (en) |
| CN (1) | CN102246256B (en) |
| RU (1) | RU2529497C2 (en) |
| WO (1) | WO2010067260A1 (en) |
Families Citing this family (15)
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| JP5134606B2 (en) * | 2009-09-28 | 2013-01-30 | 株式会社日立メディコ | X-ray CT system |
| KR101898047B1 (en) | 2010-12-22 | 2018-09-12 | 엑실룸 에이비 | Aligning and focusing an electron beam in an x-ray source |
| DE102012213605B4 (en) * | 2012-08-01 | 2015-09-10 | Siemens Aktiengesellschaft | Method for the asynchronous operation of a rotary anode with reduced focal spot wobble and associated X-ray device arrangement |
| US20140177794A1 (en) * | 2012-12-24 | 2014-06-26 | The Board Of Trustees Of The Leland Stanford Junior University | System and method for focal spot deflection |
| DE102013107736A1 (en) * | 2013-07-19 | 2015-01-22 | Ge Sensing & Inspection Technologies Gmbh | X-ray inspection device for material testing and method for generating high-resolution projections of a test specimen by means of X-rays |
| WO2015032664A1 (en) * | 2013-09-05 | 2015-03-12 | Koninklijke Philips N.V. | X-ray detection |
| TWI483282B (en) * | 2014-02-20 | 2015-05-01 | 財團法人金屬工業研究發展中心 | Radiation generating apparatus |
| TWI480912B (en) * | 2014-02-20 | 2015-04-11 | Metal Ind Res & Dev Ct | Radiation generating apparatus |
| US10460899B2 (en) | 2014-10-06 | 2019-10-29 | Koninklijke Philips N.V. | Modification arrangement for an X-ray generating device |
| US10485492B2 (en) * | 2014-11-11 | 2019-11-26 | Koninklijke Philips N.V. | Source-detector arrangement |
| WO2016191274A1 (en) * | 2015-05-22 | 2016-12-01 | Empire Technology Development Llc | X-ray imaging system |
| DE102017203932A1 (en) | 2017-03-09 | 2018-09-13 | Siemens Healthcare Gmbh | X-ray source and method for compensating a focal spot movement |
| EP3413691A1 (en) | 2017-06-08 | 2018-12-12 | Koninklijke Philips N.V. | Apparatus for generating x-rays |
| CN110664420B (en) * | 2019-10-11 | 2023-04-07 | 上海联影医疗科技股份有限公司 | Focus correction method, apparatus, computer device, and computer-readable storage medium |
| CN117174557B (en) * | 2023-11-03 | 2024-01-09 | 上海超群检测科技股份有限公司 | High-energy micro-focus X-ray tube |
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- 2009-12-01 JP JP2011539152A patent/JP5540008B2/en not_active Expired - Fee Related
- 2009-12-01 WO PCT/IB2009/055436 patent/WO2010067260A1/en active Application Filing
- 2009-12-01 RU RU2011128104/07A patent/RU2529497C2/en not_active IP Right Cessation
- 2009-12-01 US US13/131,883 patent/US8761342B2/en active Active
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| US5581591A (en) * | 1992-01-06 | 1996-12-03 | Picker International, Inc. | Focal spot motion control for rotating housing and anode/stationary cathode X-ray tubes |
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Also Published As
| Publication number | Publication date |
|---|---|
| JP5540008B2 (en) | 2014-07-02 |
| WO2010067260A1 (en) | 2010-06-17 |
| EP2374144A1 (en) | 2011-10-12 |
| RU2011128104A (en) | 2013-01-20 |
| EP2374144B1 (en) | 2016-10-12 |
| US8761342B2 (en) | 2014-06-24 |
| RU2529497C2 (en) | 2014-09-27 |
| CN102246256A (en) | 2011-11-16 |
| US20110235784A1 (en) | 2011-09-29 |
| JP2012511235A (en) | 2012-05-17 |
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